This document contains code for a Visual Basic form and a SQL stored procedure. The form code includes event handlers for buttons and text boxes that call the stored procedure, passing parameters and displaying the result. The stored procedure code updates rental records by calculating late fees based on the rental due date and actual return date passed to it, then returns the total late fee amount.

1. **visual
Imports System.Data
Imports System.Data.SqlClient
Public Class Form1
Private Sub Label2_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Label2.Click
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim conexion As New SqlConnection("Data Source=MIRIAM-
HPSQLEXPRESS;Initial Catalog=bd_pelicula;Integrated Security=True")
Dim comando As New SqlCommand()
comando.Connection = conexion
comando.CommandType = CommandType.StoredProcedure
comando.CommandText = "calcular"
comando.Parameters.Clear()
Dim pel As Integer = CInt(TextBox1.Text)
Dim ren As Integer = CInt(TextBox2.Text)
Dim fecha As Date = DateTimePicker1.Value
comando.Parameters.AddWithValue("@idrenta", ren)
comando.Parameters.AddWithValue("@idpeli", pel)
comando.Parameters.AddWithValue("@fechareal", fecha)
conexion.Open()
TextBox3.Text = comando.ExecuteScalar().ToString()
conexion.Close()
End Sub
End Class
**procedimiento
USE [bd_pelicula]
GO
/****** Object: StoredProcedure [dbo].[calcular] Script Date: 12/03/2012
13:07:55 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author: <Author,,Name>
-- Create date: <Create Date,,>
-- Description: <Description,,>
-- =============================================
ALTER PROCEDURE [dbo].[calcular]

2. -- Add the parameters for the stored procedure here
@idrenta as int,
@idpeli as int,
@fechareal as datetime
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
declare @precio as money
select @precio = penalizacion from pelicula where id_pelicula = @idpeli
update pelicula set no_copias = no_copias+1 where id_pelicula= @idpeli
update Renta_detalle set fecha_real = @fechareal where id_pelicula = @idpeli and
id_renta = @idrenta
declare @diffecha as int
select @diffecha = datediff(DD, fecha_devolucion, @fechareal)from Renta_detalle
where id_renta = @idrenta
update Renta_detalle set dias_penalizacion = @diffecha where id_pelicula =
@idpeli and id_renta = @idrenta
update Renta_detalle set costo_penalizacion = @precio * @diffecha where
id_pelicula = @idpeli and id_renta = @idrenta
--hay que regresar un dato del procedimieto
select @precio * @diffecha as 'total'
END
**